A diagonal rock foundation segmented hole filling pile structure

Abstract

The application provides a segmented hole pouring pile structure of inclined rock foundation, belonging to the technical field of building foundation engineering, comprising a segmented pile body, an adjusting seat, a lower inclined groove, a depth direction of the lower inclined groove, a depth direction of the adjusting seat, a lower moving seat, an upper moving seat, a lower inserting rod, an upper inserting rod, a top end of the upper inserting rod, a bottom end of the lower inserting rod, a power assembly, a driving direction of the lower moving seat and the upper moving seat, and a hard rock surface and a soft rock surface. The application forms a cross anchoring structure by the adjusting seat, the lower moving seat and the upper moving seat, and solves the problem of unreliable bearing caused by uneven rock properties of the inclined rock foundation.

Description

Technical Field

[0001] This invention relates to the field of building foundation engineering technology, and more specifically, to a segmented bored pile structure for inclined rock foundation. Background Technology

[0002] Inclined rock foundations refer to a special type of foundation characterized by a significant inclination angle (usually greater than 5°), uneven lithological distribution, and irregular rock surface undulations. They are widely distributed in mountainous, hilly, and other areas with complex terrain. Their core characteristics include large differences in rock surface slope, numerous interfaces between soft and hard rocks, well-developed rock joints, and uneven distribution of bearing capacity. Compared to homogeneous or gently sloping rock foundations, this presents significant complexity and challenges to foundation engineering construction.

[0003] For the construction of cast-in-place piles on inclined rock foundations, existing technologies still follow the core construction logic of homogeneous foundations, mainly adopting the construction method of integral drilling and one-time pouring. The specific process is as follows: first, a full-depth integral hole is drilled in the inclined rock foundation using drilling equipment. During the drilling process, the verticality is controlled by the rigidity of the drill bit itself or a simple guiding device. After drilling is completed, a reinforcing cage is lowered into the hole and concrete is poured in one go to form a complete pile body. Some improved technologies will spray mud onto the hole wall or install a simple casing after drilling to temporarily reinforce the hole wall.

[0004] However, in inclined rock foundations, the borehole wall stability is extremely poor at the interface between soft and hard rock. Cast-in-place piles rely solely on the friction between the pile body and the surrounding soil and rock mass for load-bearing capacity; on inclined rock foundations, the reliability of this load-bearing method is significantly reduced. Summary of the Invention

[0005] The purpose of this invention is to provide a segmented bored pile structure for inclined rock foundations, which can adapt to the interface between soft and hard rock in inclined rock and increase the bearing capacity between the bored pile and the inclined rock foundation.

[0006] The embodiments of the present invention are achieved through the following technical solution: a segmented bored pile structure for inclined rock foundation, comprising a segmented pile body, wherein an adjusting seat is fixedly provided on the segmented pile body, the lower edge of the adjusting seat is provided with a downward inclined groove, the depth of the downward inclined groove being from shallow to deep along the depth direction of the adjusting seat; the upper edge of the adjusting seat is provided with an upward inclined groove, the depth of the upward inclined groove being from deep to shallow along the depth direction of the adjusting seat, and the downward inclined groove and the upward inclined groove are staggered. The segmented pile body is provided with a downward moving seat and an upward moving seat above and below the adjusting seat, respectively. The lower edge of the downward moving seat is rotatably provided with multiple lower insert rods, and the upper edge of the upward moving seat is rotatably provided with multiple upper insert rods. The top end of the upper insert rod slides against the lower inclined groove, and the bottom end of the lower insert rod slides against the upper inclined groove. The segmented pile body is equipped with a power assembly, which is used to drive the downward moving seat and the upward moving seat to move closer to each other, and drive the lower insertion rod and the upper insertion rod to protrude from the side of the segmented pile body and be inserted into the hard rock surface and the soft rock surface respectively in a cross shape.

[0007] Furthermore, the tips of the upper and lower insert rods are rotatably equipped with drill bits, and motors are installed inside the upper and lower insert rods, driving the drill bits to drill holes toward the pile wall.

[0008] Furthermore, the lower edge of the downward moving seat is provided with a sliding hole along the axial direction, an upper sliding block is slidably disposed in the sliding hole, the top end of the lower insert rod is rotatably disposed on the upper sliding block, the top end of the upper sliding block is provided with an upper pressure spring, and the top end of the upper pressure spring is fixedly disposed on the downward moving seat; The upper edge of the upward moving seat is provided with a sliding hole along the axial direction. A lower sliding block is slidably disposed in the sliding hole. The top end of the upper insertion rod is rotatably disposed on the lower sliding block. A push spring is provided at the top end of the lower sliding block. The top end of the push spring is fixedly disposed on the upward moving seat.

[0009] Furthermore, the upper insertion rod is internally equipped with an expansion wheel, and the side of the upper insertion rod has a side opening for the expansion wheel to rotate out. The expansion wheel rotates out of the side of the upper insertion rod and abuts against the hole wall of the drilled hole.

[0010] Furthermore, the edge of the extended wheel is provided with serrations.

[0011] Furthermore, a fixed seat is fixedly installed on the segmented pile body. The fixed seat is located on the lower edge of the upward moving seat. Multiple connecting ropes are installed on the fixed seat. A through hole is opened inside the upward moving seat along the axial direction. The upper insertion rod is hollow inside. A pulling rack is slidably installed inside the upper insertion rod. The end of the connecting rope passes through the through hole and is fixedly connected to the pulling rack. A gear is coaxially installed with the rotation shaft of the extension wheel. The pulling rack meshes with the gear.

[0012] Furthermore, both the upper and lower insert rods are equipped with magnets, which attract the surface of the segmented pile body.

[0013] Furthermore, the surface protrusion of the lower insertion rod is provided with barbs.

[0014] Furthermore, a spring is provided on the surface of the lower insertion rod, and the spring abuts against the inner side of the barb.

[0015] Furthermore, the sidewalls of the segmented pile body are uniformly provided with grouting holes.

[0016] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects: 1. This invention uses the staggered upper and lower inclined groove design of the adjustment seat, combined with the sliding downward moving seat and the upward moving seat, to drive the upper insertion rod to accurately insert into the upper hard rock surface and the lower insertion rod to insert into the lower soft rock surface, forming a cross anchoring structure. This breaks through the limitations of traditional friction bearing and solves the problem of unreliable bearing caused by uneven lithology of inclined rock foundations. 2. The present invention uses a rotatable sawtooth extension wheel built into the upper insertion rod, which, together with the gear-rack transmission structure, can further abut and engage with the hole wall after being inserted into hard rock; the lower insertion rod is equipped with a barb with elastic support, which has a significant anti-backflow effect after being embedded in soft rock. The double reinforcement structure ensures a reliable connection between the pile body and the rock foundation, and greatly improves the anti-slip capability. 3. The present invention uses magnets configured on the upper and lower insertion rods, which can be placed close to the pile body during lowering to avoid collision with the hole wall; the tip of the insertion rod has a built-in drive drill bit, which can be preset to drill the hole channel, adapting to the insertion requirements of complex rock surfaces in inclined foundations. At the same time, the segmented pile body splicing design facilitates transportation and on-site construction, reducing the risks of drilling and installation in inclined foundations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram illustrating the internal structure of the upper insertion rod in this invention; Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle; Figure 4 This is a schematic diagram illustrating the structure of the lower insertion rod in this invention; Figure 5 for Figure 1 Enlarged schematic diagram of part B in the middle; Figure 6 for Figure 1 An enlarged schematic diagram of section C; Figure 7 This is a schematic diagram used to demonstrate the working status in this invention; Figure 8 This is a schematic diagram illustrating the assembly relationship between the connecting rope and the pulling rack in this invention.

[0019] Icons: 1. Segmented pile body; 10. Upward moving seat; 101. Upper insertion rod; 102. Side opening; 103. Gear; 104. Extending wheel; 105. Sawtooth; 106. Pulling rack; 107. Lower sliding block; 108. Downward pushing spring; 109. Perforation; 11. Downward moving seat; 111. Lower insertion rod; 112. Barb; 113. Spring; 114. Drill bit; 115. Magnet; 116. Upper sliding block; 117. Upper pressure spring; 12. Adjusting seat; 121. Upper inclined groove; 122. Lower inclined groove; 13. Fixed seat; 131. Connecting rope; 14. Grouting hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] The following description, in conjunction with specific embodiments, provides further details. Figures 1-8 As shown, this invention relates to a segmented bored pile structure for inclined rock foundations, referring to... Figure 1 It includes multiple segmented pile bodies 1 spliced ​​together to form a complete pile body. Adjacent segmented pile bodies 1 adopt a splicing structure, and a sealing gasket is set at the joint surface to ensure sealing.

[0023] Reference Figure 1On the segmented pile body 1 corresponding to the interface between soft and hard rock in the inclined rock foundation, a set of downwardly moving seats 11 and upwardly moving seats 10 facing each other are provided. Both the downwardly moving seats 11 and upwardly moving seats 10 are slidably fitted onto the segmented pile body 1. Multiple upper insertion rods 101 are rotatably provided on the upper edge of the upwardly moving seat 10 for insertion into the upper hard rock surface. Multiple lower insertion rods 111 are evenly arranged circumferentially on the lower edge of the downwardly moving seat 11 for insertion into the lower soft rock surface. The upwardly moving seat 10 is located below the downwardly moving seat 11. An adjusting seat 12 is fixedly installed between the downwardly moving seat 11 and the upwardly moving seat 10 on the segmented pile body 1. An upwardly inclined groove 121 is formed on the side of the adjusting seat 12 from the upper edge to the midpoint, and the depth of the upwardly inclined groove 121 decreases from deep to shallow along the depth direction of the adjusting seat 12. The bottom end of the lower insertion rod 111 is slidably set on the top end of the upwardly inclined groove 121. The side of the adjusting seat 12 has a downwardly sloping groove 122 from the lower edge to the midpoint. The depth of the downwardly sloping groove 122 increases from shallow to deep along the depth direction of the adjusting seat 12. The top end of the upper insertion rod 101 is slidably disposed at the bottom end of the downwardly sloping groove 122. The upper sloping groove 121 and the downwardly sloping groove 122 are staggered.

[0024] Reference Figure 2 and Figure 3 The upper insertion rod 101 is hollow inside, with a side opening 102 on its side. A gear 103 is rotatably mounted inside the upper insertion rod 101, and an extension wheel 104 is coaxially connected to the gear 103. The diameter of the extension wheel 104 is larger than that of the gear 103, and its radius is adapted to the width of the upper insertion rod 101. The extension wheel 104 is semi-circular, with serrations 105 on its curved edge. Initially, the extension wheel 104 is retracted inside the upper insertion rod 101. When the extension wheel 104 rotates, it protrudes from the side of the upper insertion rod 101 through the side opening 102 and abuts against the borehole wall, improving the connection stability between the upper insertion rod 101 and the hard rock surface above. A pull rack 106 is also slidably installed inside the upper insertion rod 101 along the length direction. The pull rack 106 can move along the inside of the upper insertion rod 101. The gear 103 meshes with the pull rack 106, controlling the pull rack 106 to drive the extension wheel 104 to rotate.

[0025] Reference Figure 4 The surface of the lower insertion rod 111 is evenly provided with multiple sets of barbs 112 for embedding into the soft rock surface to prevent retraction. The surface of the lower insertion rod 111 is also provided with a spring piece 113, which abuts against the inner side of the barb 112 to provide elastic support for the barb 112.

[0026] Both the upper insertion rod 101 and the lower insertion rod 111 are equipped with alloy drill bits 114 at their tips, each containing a built-in micro drive motor that drives the drill bits 114 to drill a hole toward the pile wall. Both the upper insertion rod 101 and the lower insertion rod 111 are equipped with magnets 115, which are used to ensure that the upper insertion rod 101 and the lower insertion rod 111 are in close contact with the side of the segmented pile body 1 when it is lowered into the pile hole.

[0027] Reference Figure 5 and Figure 6 Both the downward moving seat 11 and the upward moving seat 10 have sliding holes along their axial direction. A lower sliding block 107 is slidably disposed within the sliding hole of the upward moving seat 10, and the bottom end of the upper insert rod 101 is rotatably connected to the lower sliding block 107. A downward pushing spring 108 is disposed on the bottom surface of the lower sliding block 107, and the other end of the downward pushing spring 108 is fixed to the upper moving seat. An upper sliding block 116 is slidably disposed within the sliding hole of the downward moving seat 11, and the top end of the lower insert rod 111 is rotatably connected to the upper sliding block 116. An upward pressure spring 117 is disposed on the top surface of the upper sliding block 116, and the top end of the upward pressure spring 117 is fixed to the downward moving seat 11.

[0028] Reference Figure 7 A power assembly is installed inside the segmented pile body 1. In this embodiment, the power assembly is hydraulically driven and includes multiple hydraulic jacks symmetrically installed inside the segmented pile body 1. These jacks drive the downward moving seat 11 and the upward moving seat 10 to approach each other along their axis. During the approach of the downward moving seat 11 and the upward moving seat 10, the bottom end of the lower insert rod 111 slides along the upper inclined groove 121, and the top end of the upper insert rod 101 slides along the lower inclined groove 122, causing the tips of the upper insert rod 101 and the lower insert rod 111 to protrude alternately from the surface of the segmented pile body 1 until they are inserted into the side wall of the pile hole. Specifically, the bottom end of the lower insert rod 111 inserts into the lower soft rock layer of the inclined rock foundation, and the top end of the upper insert rod 101 inserts into the upper hard rock layer of the inclined rock foundation.

[0029] Reference Figure 1 , Figure 2 and Figure 8 A fixed base 13 is also fixedly installed on the segmented pile body 1. The fixed base 13 is located below the upward moving base 10. Multiple connecting ropes 131 are provided on the top surface of the fixed base 13, and each of the multiple connecting ropes 131 corresponds to one of the multiple upper insertion rods 101. A through hole 109 is vertically opened inside the upward moving base 10. The connecting rope 131 passes through the through hole 109 and is fixedly connected to the pulling rack 106. When the upward moving base 10 moves upward under the action of the power component, the upward moving base 10 drives the upper insertion rods 101 away from the fixed base 13. Because the connecting rope 131 connects and restricts the position of the pulling rack 106, the pulling rack 106 is displaced relative to the gear 103, driving the gear 103 to rotate and controlling the extension wheel 104 to protrude from the side of the upper insertion rod 101.

[0030] Reference Figure 1 The segmented pile body 1 has grouting holes 14 evenly opened on its surface. Cement grout is injected into the gap between the pile body and the hole wall, and between the insertion rod and the drill hole to form a secondary reinforcement layer.

[0031] The working process of this embodiment is as follows: Based on the survey results, the splicing length of the segmented pile body 1 and the installation positions of the moving seat and the insertion rod are determined. The power assembly is activated, driving the downward moving seat 11 and the upward moving seat 10 to move closer to each other. During the approach of the moving seats, the top end of the upper insertion rod 101 slides along the downward inclined groove 122, and the bottom end of the lower insertion rod 111 slides along the upward inclined groove 121, pushing the upper insertion rod 101 and the lower insertion rod 111 to rotate and protrude outwards from the pile body, extending in a cross shape towards the hard rock surface and the soft rock surface. Simultaneously, the micro motor inside the insertion rod is activated, driving the drill bit 114 to rotate, pre-drilling channels in the hard rock surface and the soft rock surface, facilitating the precise insertion of the upper insertion rod 101 into the hard rock surface and the precise insertion of the lower insertion rod 111 into the soft rock surface. As the moving seats continue to approach, the insertion rods are fully inserted into the rock surface, and the barb 112 embeds into the rock mass to achieve anti-detachment and limiting. Meanwhile, as the upward moving seat 10 moves, the connecting rope 131 drives the rack 106 to slide, which in turn drives the gear 103 to rotate, causing the extension wheel 104 to rotate out from the side opening 102 and press against the borehole wall, further strengthening the anchoring effect.

[0032] Reinforcing grout is injected through grouting hole 14 into the gap between the pile body and the borehole wall, the gap between the pile bottom and the inclined rock surface, and the gap between the insertion rod and the borehole to ensure that the grout is fully filled. After the grout solidifies, it forms an integral load-bearing structure, which further enhances the bonding strength between the pile body and the rock foundation.

[0033] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A segmented bored pile structure for inclined rock foundation, characterized in that: The system includes a segmented pile body (1), which is fixedly provided with an adjustment seat (12). The lower edge of the adjustment seat (12) is provided with a downward inclined groove (122), the depth of which increases from shallow to deep along the depth direction of the adjustment seat (12). The upper edge of the adjustment seat (12) is provided with an upward inclined groove (121), the depth of which decreases from deep to shallow along the depth direction of the adjustment seat (12). The downward inclined groove (122) and the upward inclined groove (121) are staggered. The segmented pile body (1) is provided with a downward moving seat (11) and an upward moving seat (10) above and below the adjusting seat (12), respectively. The lower edge of the downward moving seat (11) is rotatably provided with multiple lower insert rods (111), and the upper edge of the upward moving seat (10) is rotatably provided with multiple upper insert rods (101). The top end of the upper insert rod (101) slides against the lower inclined groove (122), and the bottom end of the lower insert rod (111) slides against the upper inclined groove (121). The segmented pile body (1) is equipped with a power assembly, which is used to drive the downward moving seat (11) and the upward moving seat (10) to move closer to each other, and drive the lower insertion rod (111) and the upper insertion rod (101) to protrude from the side of the segmented pile body (1) and insert into the hard rock surface and the soft rock surface respectively in a cross shape.

2. The segmented bored pile structure for inclined rock foundation according to claim 1, characterized in that, The tips of the upper insertion rod (101) and the lower insertion rod (111) are rotatably equipped with drill bits (114), and motors are installed inside the upper insertion rod (101) and the lower insertion rod (111), which drive the drill bits (114) to drill holes toward the pile wall.

3. The segmented bored pile structure for inclined rock foundation according to claim 1, characterized in that, The lower edge of the downward moving seat (11) is provided with a sliding hole along the axial direction. An upper sliding block (116) is slidably disposed in the sliding hole. The top end of the lower insert rod (111) is rotatably disposed on the upper sliding block (116). An upper pressure spring (117) is provided on the top end of the upper sliding block (116). The top end of the upper pressure spring (117) is fixedly disposed on the downward moving seat (11). The upper edge of the upward moving seat (10) is provided with a sliding hole along the axial direction. A lower sliding block (107) is slidably disposed in the sliding hole. The top end of the upper insert rod (101) is rotatably disposed on the lower sliding block (107). A push spring (108) is provided on the top end of the lower sliding block (107). The top end of the push spring (108) is fixedly disposed on the upward moving seat (10).

4. The segmented bored pile structure for inclined rock foundation according to claim 1, characterized in that, An extension wheel (104) is rotatably provided inside the upper insertion rod (101). A side opening (102) is provided on the side of the upper insertion rod (101) for the extension wheel (104) to rotate out. The extension wheel (104) rotates out of the side of the upper insertion rod (101) and abuts against the hole wall of the drilled hole.

5. The segmented bored pile structure for inclined rock foundation according to claim 4, characterized in that, The edge of the extended wheel (104) is provided with serrations (105).

6. The segmented bored pile structure for inclined rock foundation according to claim 4, characterized in that, A fixed seat (13) is fixedly installed on the segmented pile body (1). The fixed seat (13) is located on the lower edge of the upward moving seat (10). Multiple connecting ropes (131) are installed on the fixed seat (13). A through hole (109) is opened in the interior of the upward moving seat (10) along the axial direction. The interior of the upper insertion rod (101) is hollow. A pulling rack (106) is slidably installed inside the upper insertion rod (101). The end of the connecting rope (131) passes through the through hole (109) and is fixedly connected to the pulling rack (106). A gear (103) is coaxially installed with the rotation axis of the extension wheel (104). The pulling rack (106) meshes with the gear (103).

7. The segmented bored pile structure for inclined rock foundation according to claim 3, characterized in that, Both the upper insertion rod (101) and the lower insertion rod (111) are provided with magnets (115), and the magnets (115) are attracted to the surface of the segmented pile body (1).

8. The segmented bored pile structure for inclined rock foundation according to claim 1, characterized in that, The surface of the lower insert (111) is provided with barbs (112).

9. A segmented bored pile structure for inclined rock foundation according to claim 8, characterized in that, The surface of the lower insert (111) is provided with a spring piece (113), which abuts against the inner side of the barb (112).

10. A segmented bored pile structure for inclined rock foundation according to claim 1, characterized in that, The segmented pile body (1) has grouting holes (14) evenly distributed on its sidewalls.

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